|
FR1327877A
|
|
Telephone link equipped with a hybrid transformer balancing circuit
|
|
FR1327879A
|
|
Bilateral telephone link equipped with a device for blocking the channel at rest
|
|
FR1229051A
|
|
Improvements to manually operated switching devices
|
|
FR1210286A
|
|
Bidirectional transistor repeater
|
|
FR1145095A
|
|
Telephone repeater
|
|
FR1152197A
|
|
Device for measuring echoes on telephone cables
|
|
FR1129768A
|
|
Audible signal weighing device
|
|
FR1129769A
|
|
Electrical remote signaling installation
|
|
FR1135444A
|
|
Improvements to differential circuits used in particular in telecommunications
|
|
FR1137473A
|
|
Precision thermometric installation allowing remote reading
|
|
ES215599A3
|
|
Improvements in bilateral telephone systems, with loudspeakers (Machine-translation by Google Translate, not legally binding)
|
|
FR1093929A
|
|
Method and apparatus for the automatic control of electrical alarm installations
|
